261622783 has 2 divisors, whose sum is σ = 261622784. Its totient is φ = 261622782.

The previous prime is 261622747. The next prime is 261622807. The reversal of 261622783 is 387226162.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-261622783 is a prime.

It is equal to p_14279716 and since 261622783 and 14279716 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261632783) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130811391 + 130811392.

It is an arithmetic number, because the mean of its divisors is an integer number (130811392).

Almost surely, 2^261622783 is an apocalyptic number.

261622783 is a deficient number, since it is larger than the sum of its proper divisors (1).

261622783 is an equidigital number, since it uses as much as digits as its factorization.

261622783 is an evil number, because the sum of its binary digits is even.

The product of its digits is 48384, while the sum is 37.

The square root of 261622783 is about 16174.7575870552. The cubic root of 261622783 is about 639.5755510866.

The spelling of 261622783 in words is "two hundred sixty-one million, six hundred twenty-two thousand, seven hundred eighty-three".